Golbat (Generations GEN 31)

Golbat — 70 HP — [P]
Stage 1 — Evolves from Zubat

Ability: Sneaky Bite
When you play this Pokémon from your hand to evolve 1 of your Pokémon, you may put 2 damage counters on 1 of your opponent’s Pokémon.

[C] Swoop Across
This attack does 10 damage to each of your opponent’s Pokémon. (Don’t apply Weakness and Resistance for Benched Pokémon.)

weakness: [L]×2
resistance: [F]-20
retreat: 0

Illus. Kanako Eo
Generations — 31/83 — Uncommon

Once it bites, it will not stop draining energy from the victim even if it gets too heavy to fly.